1) The corrosion resistance of galvanized steel sheets is 3 to 5 times that of galvanized steel sheets, and the more severe the corrosion, the greater the difference. Therefore, in the construction roof, galvanized steel sheet AZ150 should be preferred. If galvanized steel is used, it should not be lower than Z275, and its service life is much lower than that of AZ150. Therefore, Australia and other countries clearly stipulate that if galvanized steel is used as roof (wall), Z450 must be used.
2) AZ150 is about 10-20% more expensive than Z275, but its corrosion resistance is 3~5 times. It can be seen that galvanized steel has excellent performance and price ratio.
The utility model provides an electronic igniter, which is characterized in that it is composed of a shell with an ignition port at the left end and a button port on it, an ignition tube connected with the ignition port at the left end of the shell, an ignition device fixedly connected with the button port, and a cable connected with the ignition device. The ignition device is composed of a rectangular shell and a button sliding connected with the upper end of the shell, The utility model is composed of a striker connected with the lower surface of the button, a power generation ceramic block fixedly connected with the bottom of the shell, a thimble connected with the upper surface of the power generation ceramic block, and a spring which is connected with the power generation ceramic block and sheathed outside the thimble. The electronic igniter has the characteristics of simple structure, safe and reliable, convenient operation, no need to use batteries, etc., which is not only economical and environmental protection, but also convenient for wide promotion.
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